For what it is worth, using the 16.3 code my client which last synchronized on September 27th, 2019 was able to catch up to the tip in about 30 minutes.
If anyone is building with the latest boost (I'm using 1.72 here) you will probably want this patch too in order to prevent a build error.
diff --git a/src/httpserver.cpp b/src/httpserver.cpp
index 6ada0f762..6b2eb2c7f 100644
--- a/src/httpserver.cpp
+++ b/src/httpserver.cpp
@@ -13,6 +13,7 @@
#include <sync.h>
#include <ui_interface.h>
+#include <deque>
#include <memory>
#include <stdio.h>
#include <stdlib.h>